Get access

Lake sediments deposited on the Flims rockslide mass: the key to date the largest mass movement of the Alps

Authors

  • Gaudenz Deplazes,

    1. Geological Institute, Swiss Federal Institute of Technology ETHZ, CH-8092 Zürich, Switzerland
    Search for more papers by this author
  • Flavio S. Anselmetti,

    1. Geological Institute, Swiss Federal Institute of Technology ETHZ, CH-8092 Zürich, Switzerland
    2. Eawag Swiss Federal Institute of Aquatic Science and Technology, CH-8600 Dubendonf, Switzerland
    Search for more papers by this author
  • Irka Hajdas

    1. Institute of Particle Physics, Swiss Federal Institute of Technology ETHZ, Schafmattstr. 20, CH-8093 Zürich, Switzerland
    Search for more papers by this author

G. Deplazes, Tollwiesstr. 29, CH-8700, Küsnacht, Switzerland. Tel.: +41 44 910 4575; e-mail: gaudenz.deplazes@alumni.ethz.ch

Abstract

Long piston cores taken from the subsurface of two mountain lakes of the eastern Swiss Alps recovered sediments, which overlie the Flims rockslide deposits. These sediments provide new information on the chronology of the largest known Alpine rockslide and can be used to reconstruct the post landslide environmental evolution. The oldest 14C date of the lake sediments yields a minimum age of the rockslide at 9660–9430 cal. yr BP. In addition, the dating of a wood fragment contained in the rockslide deposits directly below the lake sediments shows a maximum age of 9480–9120 cal. yr BP. The overlap of the maximum and minimum ages, 9480–9430 cal. yr BP, approximates the age of the Flims rockslide. This early Holocene range coincides with a period of higher frequency of large mass movements observed in the Alps, which could be related to climatic changes.

Get access to the full text of this article

Ancillary